drm/amdgpu: Create version number for coredumps

Even if there's nothing currently parsing amdgpu's coredump files, if
we eventually have such tools they will be glad to find a version field
to properly read the file.

Create a version number to be displayed on top of coredump file, to be
incremented when the file format or content get changed.

Signed-off-by: André Almeida <andrealmeid@igalia.com>
Reviewed-by: Shashank Sharma <shashank.sharma@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_reset.c

@@ -185,6 +185,7 @@ amdgpu_devcoredump_read(char *buffer, loff_t offset, size_t count,
 	p = drm_coredump_printer(&iter);
 
 	drm_printf(&p, "**** AMDGPU Device Coredump ****\n");
+	drm_printf(&p, "version: " AMDGPU_COREDUMP_VERSION "\n");
 	drm_printf(&p, "kernel: " UTS_RELEASE "\n");
 	drm_printf(&p, "module: " KBUILD_MODNAME "\n");
 	drm_printf(&p, "time: %lld.%09ld\n", coredump->reset_time.tv_sec,

drivers/gpu/drm/amd/amdgpu/amdgpu_reset.h

@@ -90,6 +90,9 @@ struct amdgpu_reset_domain {
 };
 
 #ifdef CONFIG_DEV_COREDUMP
+
+#define AMDGPU_COREDUMP_VERSION "1"
+
 struct amdgpu_coredump_info {
 	struct amdgpu_device		*adev;
 	struct amdgpu_task_info         reset_task_info;